Triangles

How many triangles are there in this figure ?

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The Next Number

Find the next number in the series:
1/2,1,2,5. 10,20,50, 100,?

A bit harder than usual for a quickie. Find the missing numbers in
the series:
10,11,12,13,14,15,16,17,20,22,24,?, 100, 121,?
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A question of remainders

Right, now for a problem that is well within the scope of those of you with micros, or even programmable calculators.

If you divided 2519 by 10, there is a remainder of 9.
If you divide 2519 by 9, there is a remainder of 8.
If you divide 2519 by 8, there is a remainder of 7, and so on.
Can you find two other numbers with the same property?

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